[RFC 3/3] mm: iommu: The Virtual Contiguous Memory Manager

[Hari Kanigeri]

> The VCMM takes the long view. Its designed for a future in which the
> number of IOMMUs will go up and the ways in which these IOMMUs are
> composed will vary from system to system, and may vary at
> runtime. Already, there are ~20 different IOMMU map implementations in
> the kernel. Had the Linux kernel had the VCMM, many of those
> implementations could have leveraged the mapping and topology management
> of a VCMM, while focusing on a few key hardware specific functions (map
> this physical address, program the page table base register).
>

-- Sounds good.
Did you think of a way to handle the cases where one of the Device
that is using the mapped address crashed ?
How is the physical address unbacked in this case ?

Hari